I made a Norm-style single runner panel cutter. I made the runner out of 3/8" X 3/4" mild steel. It wouldn't fit the T.S. slot from the store. I had to grind/file it to fit. I took some time there to get a nice snug but not rubbing fit. I then drilled and tapped 2 holes in the steel runner and screwed 1/2" ply to that. One nice thing about the 'one-sided' sled is that it's nice and light and easy to store. I wax the sides of the miter bar periodically to eliminate miter slot wear. I should (but haven't) made a 'dummy' for the right side that doesn't move. That would eliminate any risk of the very end of the cut dropping & breaking.